Check the current currency exchange rate. You may use a website to find out exactly what the exchange rate is between Australian dollars and British pounds. As of Nov. 16, 2010, for example one Australian dollar was equal to .61297 British pounds.
Multiply the Australian dollar amount by .61297 or an updated exchange rate. This will give you the Australian dollar amount in British pounds. For example, if you have five Australian Dollars, this will be worth 3.06487 British pounds.
Use a website to do the exchange rate for you. There are numerous websites that can calculate the conversion, so you do not have to do it yourself. This is especially useful if calculating larger amounts of Australian dollars to British pounds.